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In-Cell, On-Cell and OGS, three full fit screen technology

15 May 2017 -

    Full fit is to glue or optical glue to the panel and touch screen in a seamless way completely paste together. Compared to the box stickers, can provide better display. Currently on the market common all-in-one screen is mainly the original touch screen manufacturers led OGS program, as well as by the panel manufacturers dominated On Cell and In Cell technology program. The following are the same as the "
Full fit Advantages: Fully fit technology eliminates the air between the screens, which helps to reduce the reflection between the display panel and the glass, allowing the screen to look more transparent and enhance the display of the screen.

    Mobile phone screen in the production process need to protect the glass, touch screen, display the three parts of the two fit, if only with the box clip display effect will be greatly reduced, and if the use of all the good yield is a problem. As a result of the protection of glass, touch screen, display screen after each pass a production process, the yield will be greatly reduced, if you can reduce the number of fit, will undoubtedly improve the overall yield of the product, there are several development : The original touch screen manufacturers dominate the OGS program, as well as by the panel manufacturers dominated On Cell and In Cell technology program.

    At present, the more powerful display panel manufacturers tend to promote On-Cell or In-Cell program, mainly because it has a display production capacity, that is, tend to make the touch layer in the display; and touch module manufacturers or upstream materials Manufacturers tend to OGS, the touch layer will be made in the protection of glass, the main reason is to have a strong production process and technology. The common point of the two can reduce the number of fit, so that you can achieve cost savings to improve the yield of the fit. In addition, because of a little layer of touch layer, which can also achieve cost savings and achieve the purpose of light, and which Apple iPhone5 is the use of In-Cell technology.

In-Cell, On-Cell and OGS

    In-Cell refers to the method of embedding the touch panel function into the liquid crystal pixels, that is, embedding the touch sensor function inside the display screen, which makes the screen more thin. At the same time In-Cell screen also embedded in the matching touch IC, otherwise it is easy to lead to the wrong touch sensor signal or too much noise. Therefore, for any display panel manufacturers, cut into the In-Cell / On-Cell-type touch screen technology threshold is indeed quite high, still need the low yield of this difficult. Currently using In-Cell technology in addition to Apple's iPhone 5, as well as Nokia's Lumia920. Which iPhone5 screen thickness is estimated to be 2.54mm, In-Cell thinning contribution of 0.44mm, about the thickness of 1.7mm down to about 25%.
    IPhone5 iPhone4S less than the touch screen this layer
    Although the current giant of Apple to vigorously promote In-Cell technology, but in the next few years is still limited to the field of high-end smart phones, the main problem or yield, because In-Cell once the loss of damage is not just a touch screen, the display also Will be together with the scrapped, so manufacturers of In-Cell yield requirements higher.
    OGS technology is to touch the screen and protective glass together, in the protection of glass inside the ITO conductive layer, directly on the protection of glass coating and lithography, due to save a glass and a fit, the touch screen can do more Thin and less costly. At present, the domestic mobile phone brand manufacturers such as Sky Hornets 1 generation, Jin Li Fenghua, millet 2 have adopted the OGS technology.
    However, OGS still faces the problem of strength and processing costs. Since the OGS protection glass and the touch screen are integrated together, it is usually necessary to reinforce, then coat, etch, and finally cut. This is very troublesome in the strengthening of the glass, the cost is high, low yield, and cause the glass edge to form some capillary cracks, these cracks reduce the strength of the glass, the current lack of strength to become an important factor restricting the development of OGS.

    On Cell refers to the method of embedding the touch screen into the color filter substrate and the polarizer of the display screen, that is, touching the sensor on the LCD panel, which is much less difficult than the In Cell technology. Samsung, Hitachi, LG and other manufacturers in the On-Cell structure touch screen on the faster progress, at present, On Cell used in Samsung Amoled panel products, the technology has not yet overcome the thin, touch the color uneven problems.

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